When aluminium profile come out of the extruder ,the tem. is about 550, and not many material can stand such high temp. For long time .PBO fiber is the kind of material that can resist high temp up to 600,The needle punched roller sleeve that composed of PBO/Kevlar is ideal to use at extrusion initial area and beginning of the run-out table .It is the density of PBO layer enable the roller sleeve to work continuously under temp of 550,and at the same time to stand the abrasion from different shapes of the profile.
